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Based on the output below, it can be assumed that no SFP is plugged in, yet the link status is shown as Up. Additionally, on the FortiGate, the port's LED appears green even though nothing is connected to the port.
Note 1: In some cases, the port flaps instead to be permanently down.
Note 2: To reboot the device may return to normal, but after some time, the issue automatically reappears.
FGT_A # get system interface transceiver x7
Interface x7 - Transceiver is not detected.
FGT_A # show system interface x7
config system interface
edit "x7"
set vdom "root"
set type physical
set mediatype sr
set snmp-index 33
set speed 10000full
next
end
FGT_A # show system interface x7
config system interface
edit "x7"
set vdom "root"
set type physical
set mediatype sr
set snmp-index 33
set speed 10000full
next
end
FGT_A # fnsysctl ifconfig x7
x7 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:176 errors:0 dropped:0 overruns:0 frame:0
TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:22176 (21.7 KB) TX bytes:786 (786 Bytes)
FGT_A # diagnose hardware deviceinfo nic x7
Description :FortiASIC NP7 Adapter
Driver Name :FortiASIC Unified NPU Driver
pid :31
oid :158
vid :4030
macid :30
eif_id :2
promiscous :1
local_port :1
vlan_wa_done :0
mtu :1500
netdev oid :158
dev-flags :1103
dev-promis :1
Current_HWaddr xx:xx:xx:xx:xx:xx
Permanent_HWaddr xx:xx:xx:xx:xx:xx
==== Default Link Settings =====
auto-nego :Disable
s_speed :10000
s_duplex :Full
==== Current Link Settings =====
auto-nego :Disable
s_status :Up
s_speed :10000
s_duplex :Full
FEC :OFF (0x2)
FEC_cap :NONE (0x1)
SerDes_if :SR
SerDes_if_cap :GMII,SGMII,SR,LR,CR (0x3e)
SerDes_dflt :3
pm_mode_setting :0
pm_mode :0x0
pm_mode_dflt :0
pm_port :No
medium_mode :0
==== Link Status ===============
Admin :Up
link_status :Up
Speed :10000
Duplex :Full
==== Netdev Status =============
dev_running :Yes
dev_carrier :On
==== Host Counters =============
hrx_pkts :88
hrx_bytes :10032
htx_pkts :7
htx_bytes :786
htx_drop :0
htx_e_busy :0
htx_e_noheadroom:0
htx_e_oid :0
htx_e_adapter :0
htx_e_pad :0
htx_e_other :0
==== Netdev Counters ===========
Rx Pkts :176
Rx Bytes :22176
Tx Pkts :7
Tx Bytes :786
==== Transceiver Info ==========
tx_disable : N/A
rx_los : N/A
tx_fault : N/A
present : N/A
last_spd : 0
FGT_A # get system interface physical x7
== [onboard]
==[x7]
mode: static
ip: 0.0.0.0 0.0.0.0
ipv6: ::/0
status: up
speed: 10000Mbps (Duplex: full)
FEC: none
FEC_cap: {none}
The issue can be fixed by upgrading to the FortiOS versions 7.4.8 or 7.6.5.
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